Yet more tweaking for #497/YAML test

Author: cowtowncoder

yaml/src/test/java/com/fasterxml/jackson/dataformat/yaml/deser/UnicodeYAMLRead497Test.java

@@ -2,6 +2,7 @@
 
 import java.io.ByteArrayInputStream;
 import java.nio.charset.StandardCharsets;
+import java.util.Arrays;
 
 import org.junit.jupiter.api.Test;
 
@@ -10,6 +11,7 @@
 import com.fasterxml.jackson.dataformat.yaml.ModuleTestBase;
 import com.fasterxml.jackson.dataformat.yaml.YAMLMapper;
 
+import static org.junit.jupiter.api.Assertions.assertArrayEquals;
 import static org.junit.jupiter.api.Assertions.assertEquals;
 
 // [dataformats-text#497]: 3-byte UTF-8 character at end of content
@@ -40,7 +42,7 @@ public void testUnicodeAtEnd() throws Exception
  _testUnicodeAtEnd(4097);
  }
 
- void _testUnicodeAtEnd(int LEN) throws Exception
+ private void _testUnicodeAtEnd(int LEN) throws Exception
  {
  StringBuilder sb = new StringBuilder(LEN + 2);
  sb.append("key: ");
@@ -53,20 +55,26 @@ void _testUnicodeAtEnd(int LEN) throws Exception
 
  sb.append(valueBuffer);
  final byte[] doc = sb.toString().getBytes(StandardCharsets.UTF_8);
+ final byte[] docOrig = Arrays.copyOf(doc, doc.length);
 
  try (JsonParser p = MAPPER.createParser(doc)) {
- assertToken(JsonToken.START_OBJECT, p.nextToken());
- assertEquals("key", p.nextFieldName());
- assertToken(JsonToken.VALUE_STRING, p.nextToken());
- assertEquals(valueBuffer.toString(), p.getText());
+ _checkDoc(p, valueBuffer.toString());
  }
 
  try (JsonParser p = MAPPER.createParser(new ByteArrayInputStream(doc))) {
- assertToken(JsonToken.START_OBJECT, p.nextToken());
- assertEquals("key", p.nextFieldName());
- assertToken(JsonToken.VALUE_STRING, p.nextToken());
- assertEquals(valueBuffer.toString(), p.getText());
+ _checkDoc(p, valueBuffer.toString());
  }
+
+ // Verify that original byte array was not modified
+ assertArrayEquals(docOrig, doc);
  }
 
+ private void _checkDoc(JsonParser p, String value) throws Exception
+ {
+ assertToken(JsonToken.START_OBJECT, p.nextToken());
+ assertEquals("key", p.nextFieldName());
+ assertToken(JsonToken.VALUE_STRING, p.nextToken());
+ assertEquals(value, p.getText());
+ assertToken(JsonToken.END_OBJECT, p.nextToken());
+ }
 }